Top Definition
Another name for someone who is a Cock Block (hence the CB), just with a replacment of the letter "P" on the name of the Star Wars character C-3PO with the letter "B".
Friend 1: "I was hooking up with my girlfriend and just as it was getting heavy my boy Max came in the fucking room and like a giant CB3-O, just started talking!"

Friend 2: "Wow, what an asshole"
by ming chow November 15, 2011

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